1 // SPDX-License-Identifier: GPL-2.0+
3 * Copyright (C) 2018 Álvaro Fernández Rojas <noltari@gmail.com>
5 * Derived from linux/drivers/net/ethernet/broadcom/bcm63xx_enet.c:
6 * Copyright (C) 2008 Maxime Bizon <mbizon@freebox.fr>
21 #define ETH_RX_DESC PKTBUFSRX
22 #define ETH_MAX_MTU_SIZE 1518
23 #define ETH_TIMEOUT 100
24 #define ETH_TX_WATERMARK 32
26 /* ETH Receiver Configuration register */
27 #define ETH_RXCFG_REG 0x00
28 #define ETH_RXCFG_ENFLOW_SHIFT 5
29 #define ETH_RXCFG_ENFLOW_MASK (1 << ETH_RXCFG_ENFLOW_SHIFT)
31 /* ETH Receive Maximum Length register */
32 #define ETH_RXMAXLEN_REG 0x04
33 #define ETH_RXMAXLEN_SHIFT 0
34 #define ETH_RXMAXLEN_MASK (0x7ff << ETH_RXMAXLEN_SHIFT)
36 /* ETH Transmit Maximum Length register */
37 #define ETH_TXMAXLEN_REG 0x08
38 #define ETH_TXMAXLEN_SHIFT 0
39 #define ETH_TXMAXLEN_MASK (0x7ff << ETH_TXMAXLEN_SHIFT)
41 /* MII Status/Control register */
42 #define MII_SC_REG 0x10
43 #define MII_SC_MDCFREQDIV_SHIFT 0
44 #define MII_SC_MDCFREQDIV_MASK (0x7f << MII_SC_MDCFREQDIV_SHIFT)
45 #define MII_SC_PREAMBLE_EN_SHIFT 7
46 #define MII_SC_PREAMBLE_EN_MASK (1 << MII_SC_PREAMBLE_EN_SHIFT)
48 /* MII Data register */
49 #define MII_DAT_REG 0x14
50 #define MII_DAT_DATA_SHIFT 0
51 #define MII_DAT_DATA_MASK (0xffff << MII_DAT_DATA_SHIFT)
52 #define MII_DAT_TA_SHIFT 16
53 #define MII_DAT_TA_MASK (0x3 << MII_DAT_TA_SHIFT)
54 #define MII_DAT_REG_SHIFT 18
55 #define MII_DAT_REG_MASK (0x1f << MII_DAT_REG_SHIFT)
56 #define MII_DAT_PHY_SHIFT 23
57 #define MII_DAT_PHY_MASK (0x1f << MII_DAT_PHY_SHIFT)
58 #define MII_DAT_OP_SHIFT 28
59 #define MII_DAT_OP_WRITE (0x5 << MII_DAT_OP_SHIFT)
60 #define MII_DAT_OP_READ (0x6 << MII_DAT_OP_SHIFT)
62 /* ETH Interrupts Mask register */
63 #define ETH_IRMASK_REG 0x18
65 /* ETH Interrupts register */
66 #define ETH_IR_REG 0x1c
67 #define ETH_IR_MII_SHIFT 0
68 #define ETH_IR_MII_MASK (1 << ETH_IR_MII_SHIFT)
70 /* ETH Control register */
71 #define ETH_CTL_REG 0x2c
72 #define ETH_CTL_ENABLE_SHIFT 0
73 #define ETH_CTL_ENABLE_MASK (1 << ETH_CTL_ENABLE_SHIFT)
74 #define ETH_CTL_DISABLE_SHIFT 1
75 #define ETH_CTL_DISABLE_MASK (1 << ETH_CTL_DISABLE_SHIFT)
76 #define ETH_CTL_RESET_SHIFT 2
77 #define ETH_CTL_RESET_MASK (1 << ETH_CTL_RESET_SHIFT)
78 #define ETH_CTL_EPHY_SHIFT 3
79 #define ETH_CTL_EPHY_MASK (1 << ETH_CTL_EPHY_SHIFT)
81 /* ETH Transmit Control register */
82 #define ETH_TXCTL_REG 0x30
83 #define ETH_TXCTL_FD_SHIFT 0
84 #define ETH_TXCTL_FD_MASK (1 << ETH_TXCTL_FD_SHIFT)
86 /* ETH Transmit Watermask register */
87 #define ETH_TXWMARK_REG 0x34
88 #define ETH_TXWMARK_WM_SHIFT 0
89 #define ETH_TXWMARK_WM_MASK (0x3f << ETH_TXWMARK_WM_SHIFT)
91 /* MIB Control register */
92 #define MIB_CTL_REG 0x38
93 #define MIB_CTL_RDCLEAR_SHIFT 0
94 #define MIB_CTL_RDCLEAR_MASK (1 << MIB_CTL_RDCLEAR_SHIFT)
96 /* ETH Perfect Match registers */
98 #define ETH_PML_REG(x) (0x58 + (x) * 0x8)
99 #define ETH_PMH_REG(x) (0x5c + (x) * 0x8)
100 #define ETH_PMH_VALID_SHIFT 16
101 #define ETH_PMH_VALID_MASK (1 << ETH_PMH_VALID_SHIFT)
103 /* MIB Counters registers */
104 #define MIB_REG_CNT 55
105 #define MIB_REG(x) (0x200 + (x) * 4)
108 struct bcm6348_eth_priv {
115 struct phy_device *phy_dev;
118 static void bcm6348_eth_mac_disable(struct bcm6348_eth_priv *priv)
121 clrsetbits_be32(priv->base + ETH_CTL_REG, ETH_CTL_ENABLE_MASK,
122 ETH_CTL_DISABLE_MASK);
124 /* wait until emac is disabled */
125 if (wait_for_bit_be32(priv->base + ETH_CTL_REG,
126 ETH_CTL_DISABLE_MASK, false,
128 pr_err("%s: error disabling emac\n", __func__);
131 static void bcm6348_eth_mac_enable(struct bcm6348_eth_priv *priv)
133 setbits_be32(priv->base + ETH_CTL_REG, ETH_CTL_ENABLE_MASK);
136 static void bcm6348_eth_mac_reset(struct bcm6348_eth_priv *priv)
139 writel_be(ETH_CTL_RESET_MASK, priv->base + ETH_CTL_REG);
142 /* wait until emac is reset */
143 if (wait_for_bit_be32(priv->base + ETH_CTL_REG,
144 ETH_CTL_RESET_MASK, false,
146 pr_err("%s: error resetting emac\n", __func__);
149 static int bcm6348_eth_free_pkt(struct udevice *dev, uchar *packet, int len)
151 struct bcm6348_eth_priv *priv = dev_get_priv(dev);
153 return dma_prepare_rcv_buf(&priv->rx_dma, packet, len);
156 static int bcm6348_eth_recv(struct udevice *dev, int flags, uchar **packetp)
158 struct bcm6348_eth_priv *priv = dev_get_priv(dev);
160 return dma_receive(&priv->rx_dma, (void**)packetp, NULL);
163 static int bcm6348_eth_send(struct udevice *dev, void *packet, int length)
165 struct bcm6348_eth_priv *priv = dev_get_priv(dev);
167 return dma_send(&priv->tx_dma, packet, length, NULL);
170 static int bcm6348_eth_adjust_link(struct udevice *dev,
171 struct phy_device *phydev)
173 struct bcm6348_eth_priv *priv = dev_get_priv(dev);
175 /* mac duplex parameters */
177 setbits_be32(priv->base + ETH_TXCTL_REG, ETH_TXCTL_FD_MASK);
179 clrbits_be32(priv->base + ETH_TXCTL_REG, ETH_TXCTL_FD_MASK);
181 /* rx flow control (pause frame handling) */
183 setbits_be32(priv->base + ETH_RXCFG_REG,
184 ETH_RXCFG_ENFLOW_MASK);
186 clrbits_be32(priv->base + ETH_RXCFG_REG,
187 ETH_RXCFG_ENFLOW_MASK);
192 static int bcm6348_eth_start(struct udevice *dev)
194 struct bcm6348_eth_priv *priv = dev_get_priv(dev);
197 /* prepare rx dma buffers */
198 for (i = 0; i < ETH_RX_DESC; i++) {
199 ret = dma_prepare_rcv_buf(&priv->rx_dma, net_rx_packets[i],
205 /* enable dma rx channel */
206 dma_enable(&priv->rx_dma);
208 /* enable dma tx channel */
209 dma_enable(&priv->tx_dma);
211 ret = phy_startup(priv->phy_dev);
213 pr_err("%s: could not initialize phy\n", __func__);
217 if (!priv->phy_dev->link) {
218 pr_err("%s: no phy link\n", __func__);
222 bcm6348_eth_adjust_link(dev, priv->phy_dev);
224 /* zero mib counters */
225 for (i = 0; i < MIB_REG_CNT; i++)
226 writel_be(0, MIB_REG(i));
228 /* enable rx flow control */
229 setbits_be32(priv->base + ETH_RXCFG_REG, ETH_RXCFG_ENFLOW_MASK);
231 /* set max rx/tx length */
232 writel_be((ETH_MAX_MTU_SIZE << ETH_RXMAXLEN_SHIFT) &
233 ETH_RXMAXLEN_MASK, priv->base + ETH_RXMAXLEN_REG);
234 writel_be((ETH_MAX_MTU_SIZE << ETH_TXMAXLEN_SHIFT) &
235 ETH_TXMAXLEN_MASK, priv->base + ETH_TXMAXLEN_REG);
237 /* set correct transmit fifo watermark */
238 writel_be((ETH_TX_WATERMARK << ETH_TXWMARK_WM_SHIFT) &
239 ETH_TXWMARK_WM_MASK, priv->base + ETH_TXWMARK_REG);
242 bcm6348_eth_mac_enable(priv);
244 /* clear interrupts */
245 writel_be(0, priv->base + ETH_IRMASK_REG);
250 static void bcm6348_eth_stop(struct udevice *dev)
252 struct bcm6348_eth_priv *priv = dev_get_priv(dev);
254 /* disable dma rx channel */
255 dma_disable(&priv->rx_dma);
257 /* disable dma tx channel */
258 dma_disable(&priv->tx_dma);
261 bcm6348_eth_mac_disable(priv);
264 static int bcm6348_eth_write_hwaddr(struct udevice *dev)
266 struct eth_pdata *pdata = dev_get_platdata(dev);
267 struct bcm6348_eth_priv *priv = dev_get_priv(dev);
268 bool running = false;
270 /* check if emac is running */
271 if (readl_be(priv->base + ETH_CTL_REG) & ETH_CTL_ENABLE_MASK)
276 bcm6348_eth_mac_disable(priv);
278 /* set mac address */
279 writel_be((pdata->enetaddr[2] << 24) | (pdata->enetaddr[3]) << 16 |
280 (pdata->enetaddr[4]) << 8 | (pdata->enetaddr[5]),
281 priv->base + ETH_PML_REG(0));
282 writel_be((pdata->enetaddr[1]) | (pdata->enetaddr[0] << 8) |
283 ETH_PMH_VALID_MASK, priv->base + ETH_PMH_REG(0));
287 bcm6348_eth_mac_enable(priv);
292 static const struct eth_ops bcm6348_eth_ops = {
293 .free_pkt = bcm6348_eth_free_pkt,
294 .recv = bcm6348_eth_recv,
295 .send = bcm6348_eth_send,
296 .start = bcm6348_eth_start,
297 .stop = bcm6348_eth_stop,
298 .write_hwaddr = bcm6348_eth_write_hwaddr,
301 static const struct udevice_id bcm6348_eth_ids[] = {
302 { .compatible = "brcm,bcm6348-enet", },
306 static int bcm6348_mdio_op(void __iomem *base, uint32_t data)
308 /* make sure mii interrupt status is cleared */
309 writel_be(ETH_IR_MII_MASK, base + ETH_IR_REG);
312 writel_be(data, base + MII_DAT_REG);
314 /* wait until emac is disabled */
315 return wait_for_bit_be32(base + ETH_IR_REG,
316 ETH_IR_MII_MASK, true,
320 static int bcm6348_mdio_read(struct mii_dev *bus, int addr, int devaddr,
323 void __iomem *base = bus->priv;
326 val = MII_DAT_OP_READ;
327 val |= (reg << MII_DAT_REG_SHIFT) & MII_DAT_REG_MASK;
328 val |= (0x2 << MII_DAT_TA_SHIFT) & MII_DAT_TA_MASK;
329 val |= (addr << MII_DAT_PHY_SHIFT) & MII_DAT_PHY_MASK;
331 if (bcm6348_mdio_op(base, val)) {
332 pr_err("%s: timeout\n", __func__);
336 val = readl_be(base + MII_DAT_REG) & MII_DAT_DATA_MASK;
337 val >>= MII_DAT_DATA_SHIFT;
342 static int bcm6348_mdio_write(struct mii_dev *bus, int addr, int dev_addr,
345 void __iomem *base = bus->priv;
348 val = MII_DAT_OP_WRITE;
349 val |= (reg << MII_DAT_REG_SHIFT) & MII_DAT_REG_MASK;
350 val |= (0x2 << MII_DAT_TA_SHIFT) & MII_DAT_TA_MASK;
351 val |= (addr << MII_DAT_PHY_SHIFT) & MII_DAT_PHY_MASK;
352 val |= (value << MII_DAT_DATA_SHIFT) & MII_DAT_DATA_MASK;
354 if (bcm6348_mdio_op(base, val)) {
355 pr_err("%s: timeout\n", __func__);
362 static int bcm6348_mdio_init(const char *name, void __iomem *base)
368 pr_err("%s: failed to allocate MDIO bus\n", __func__);
372 bus->read = bcm6348_mdio_read;
373 bus->write = bcm6348_mdio_write;
375 snprintf(bus->name, sizeof(bus->name), "%s", name);
377 return mdio_register(bus);
380 static int bcm6348_phy_init(struct udevice *dev)
382 struct eth_pdata *pdata = dev_get_platdata(dev);
383 struct bcm6348_eth_priv *priv = dev_get_priv(dev);
387 bus = miiphy_get_dev_by_name(dev->name);
390 priv->phy_dev = phy_connect(bus, priv->phy_id, dev,
391 pdata->phy_interface);
392 if (!priv->phy_dev) {
393 pr_err("%s: no phy device\n", __func__);
397 priv->phy_dev->supported = (SUPPORTED_10baseT_Half |
398 SUPPORTED_10baseT_Full |
399 SUPPORTED_100baseT_Half |
400 SUPPORTED_100baseT_Full |
404 priv->phy_dev->advertising = priv->phy_dev->supported;
407 phy_config(priv->phy_dev);
412 static int bcm6348_eth_probe(struct udevice *dev)
414 struct eth_pdata *pdata = dev_get_platdata(dev);
415 struct bcm6348_eth_priv *priv = dev_get_priv(dev);
416 struct ofnode_phandle_args phy;
417 const char *phy_mode;
420 /* get base address */
421 priv->base = dev_remap_addr(dev);
424 pdata->iobase = (phys_addr_t) priv->base;
427 pdata->phy_interface = PHY_INTERFACE_MODE_NONE;
428 phy_mode = dev_read_string(dev, "phy-mode");
430 pdata->phy_interface = phy_get_interface_by_name(phy_mode);
431 if (pdata->phy_interface == PHY_INTERFACE_MODE_NONE)
435 if (dev_read_phandle_with_args(dev, "phy", NULL, 0, 0, &phy))
437 priv->phy_id = ofnode_read_u32_default(phy.node, "reg", -1);
439 /* get dma channels */
440 ret = dma_get_by_name(dev, "tx", &priv->tx_dma);
444 ret = dma_get_by_name(dev, "rx", &priv->rx_dma);
448 /* try to enable clocks */
453 ret = clk_get_by_index(dev, i, &clk);
457 ret = clk_enable(&clk);
459 pr_err("%s: error enabling clock %d\n", __func__, i);
463 ret = clk_free(&clk);
465 pr_err("%s: error freeing clock %d\n", __func__, i);
470 /* try to perform resets */
472 struct reset_ctl reset;
475 ret = reset_get_by_index(dev, i, &reset);
479 ret = reset_deassert(&reset);
481 pr_err("%s: error deasserting reset %d\n", __func__, i);
485 ret = reset_free(&reset);
487 pr_err("%s: error freeing reset %d\n", __func__, i);
493 bcm6348_eth_mac_disable(priv);
496 bcm6348_eth_mac_reset(priv);
498 /* select correct mii interface */
499 if (pdata->phy_interface == PHY_INTERFACE_MODE_INTERNAL)
500 clrbits_be32(priv->base + ETH_CTL_REG, ETH_CTL_EPHY_MASK);
502 setbits_be32(priv->base + ETH_CTL_REG, ETH_CTL_EPHY_MASK);
504 /* turn on mdc clock */
505 writel_be((0x1f << MII_SC_MDCFREQDIV_SHIFT) |
506 MII_SC_PREAMBLE_EN_MASK, priv->base + MII_SC_REG);
508 /* set mib counters to not clear when read */
509 clrbits_be32(priv->base + MIB_CTL_REG, MIB_CTL_RDCLEAR_MASK);
511 /* initialize perfect match registers */
512 for (i = 0; i < ETH_PM_CNT; i++) {
513 writel_be(0, priv->base + ETH_PML_REG(i));
514 writel_be(0, priv->base + ETH_PMH_REG(i));
518 ret = bcm6348_mdio_init(dev->name, priv->base);
523 ret = bcm6348_phy_init(dev);
530 U_BOOT_DRIVER(bcm6348_eth) = {
531 .name = "bcm6348_eth",
533 .of_match = bcm6348_eth_ids,
534 .ops = &bcm6348_eth_ops,
535 .platdata_auto_alloc_size = sizeof(struct eth_pdata),
536 .priv_auto_alloc_size = sizeof(struct bcm6348_eth_priv),
537 .probe = bcm6348_eth_probe,